Back-Connection Light Receiving Element Module with Reflecting Inter-Element Body
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Solution Overview
Problem
Conventional light receiving element modules face challenges in reducing current collection resistance and improving photoelectric conversion efficiency due to insufficient alignment accuracy between element electrodes and inter-element connecting bodies, leading to increased power loss and reduced efficiency.
Innovation Solution
A light receiving element module with an inter-element connecting body that includes a tabular main body section covering the back side of the element, excluding a part of the second electrode, and an inter-element connecting section connected to an adjacent element, forming a reflecting section to incident reflected light, thereby improving light use efficiency and reducing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the inter-element connecting body is arranged on the element electrodes and heated to compression-bond, then the electrical connection between elements is achieved, but the alignment accuracy between element electrodes and inter-element connecting body is insufficient, leading to increased current collection resistance
Solution Approach 1:
The inter-element connecting body is pre-formed with electrode receiving portions and connecting sections before the bonding process. The preliminary structure includes protrusions that fit into recesses of the electrodes, ensuring accurate alignment is achieved before compression bonding occurs, thereby reducing current collection resistance while maintaining manufacturing feasibility
2Strength
If the inter-element connecting body covers the entire back side of the element, then the structural support is improved, but the reflected light cannot be made incident on the element, reducing photoelectric conversion efficiency
Solution Approach 1:
The inter-element connecting body is designed with differentiated regions: a main body section that covers most of the back side for structural support, and a light-incident section that is transparent or translucent to allow reflected light to pass through and reach the element. This local quality differentiation enables both structural integrity and photoelectric conversion efficiency to be maintained simultaneously
3Reliability
If the inter-element connecting body is made thicker to reduce connection resistance, then the electrical conductivity is improved, but the alignment accuracy and light incidence are compromised
Solution Approach 1:
The inter-element connecting body is designed with a multi-dimensional structure including a main body section with sufficient thickness for low connection resistance, and a light-incident section that extends toward the element to allow light passage. The electrode receiving portions with protrusions and recesses provide alignment in the planar dimension, while the vertical dimension maintains adequate thickness for electrical conductivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces current collection resistance and enhances photoelectric conversion efficiency by allowing reflected light to be incident on the elements, resulting in a higher power generation output with a smaller setting area and improved reliability.
Implementation Method 1
the main body section includes an inter-element connecting body that connects the adjacent light receiving element in such a manner as to form a reflecting section between the main body section and the light receiving element so as to enable reflected light to be made incident on the light receiving element
Data Source
AI summary
Light receiving elements of a back connection type including first and second electrodes on their back sides are connected by an inter-element connecting body including a tabular main body section and an inter-element connecting section to form a light receiving element module. The main body section is selectively directly connected to the first electrode and arranged on the second electrode via an insulating layer. The main body section covers substantially the entire back side of each of the light receiving elements excluding a part of the second electrode. The second electrode is connected to the inter-element connecting section of an adjacent light receiving element. The main body section forms a reflecting section between the main body section and the light receiving element to enable reflected light to be made incident on the light receiving element from a gap between the first and second electrodes.